FIDO2 for SSH login on Linux Server

Question

To establish an SSH connection between my PC (Linux) and server (Linux) I have to enter the password of the user.

ssh USER@<IP-Address>

Now I want to replace the password with FIDO2. For this I have executed the following commands on my PC and followed the instructions.

ssh-keygen -t ed25519-sk -O resident -O application=ssh:YourTextHere -f ~/.ssh/id_mykey_sk`

and

ssh-copy-id -i ~/.ssh/id_mykey_sk.pub USER@<IP-Address>

Now I have the problem when I try to establish the SSH connection it still asks for the password instead of the FIDO2 stick. What could be the reason for this?

Answer 1

I found out, that when I run the commands

eval `ssh-agent -s`

and

ssh-add -K

it works as expected.

Establish a connection to my server via

ssh USER@<IP-Address>

will now work with the FIDO2 key.